Cool vid. Thats an awesome cubera. I always find it interesting how much more curious the fish seem in the videos of deep dives. Contrasted with my own experience in shallower depths nothing that big will let you get anywhere near it except a Jewfish.
The fish must have been on the other side of the wreck. A lot of times, they don't come close. You just see them swim off even deep. In shallow, you just have to get real lucky for a fish like that or the water has to be really dirty.